Electroactive Optical Member for Uniform LCD Illumination
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Solution Overview
Problem
In liquid crystal display devices with edge-type light generating units, achieving a uniform light emitting effect is challenging due to variations in light incidence, leading to non-uniform optical pattern densities and adhesive strength issues, which can result in delamination failures.
Innovation Solution
An optical member with an interconnection layer, optical patterns, and pattern shaping wires made of electroactive polymers, allowing for control of optical pattern shapes via voltage, ensuring uniform light distribution and consistent adhesive strength across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If optical patterns are arranged with non-uniform pattern density to compensate for light incidence variations, then uniform light emitting effect is improved, but manufacturing reliability deteriorates due to increased failure probability and adhesive strength variation
Solution Approach 1:
The patent applies local quality by varying the shape and size of optical patterns at different positions rather than using uniform patterns throughout. Specifically, optical patterns closer to the light source are designed with smaller areas while those farther away have larger areas, creating locally optimized light distribution that achieves uniform overall illumination without requiring non-uniform pattern density
Solution Approach 2:
The patent changes geometric parameters (area, shape, dimensions) of optical patterns based on their position relative to the light source. By systematically varying these parameters, the patent achieves uniform light emission while maintaining consistent pattern density, thereby avoiding adhesive strength variation and manufacturing failures
2Reliability
If optical patterns are arranged with uniform pattern density to improve manufacturing reliability, then adhesive strength consistency is improved, but uniform light emitting effect deteriorates due to varying light incidence at different positions
Solution Approach 1:
The patent maintains uniform pattern density across the entire surface while applying local quality through position-dependent variations in optical pattern shape and size. This approach ensures consistent adhesive strength throughout while achieving uniform light distribution by optimizing local pattern characteristics
3Illumination intensity
If non-uniform optical pattern density is used to achieve uniform light emission, then illumination uniformity is improved, but device complexity increases due to varied pattern shapes and sizes
Solution Approach 1:
The patent systematically changes geometric parameters of optical patterns based on their position, creating a scalable design that achieves uniform light emission. The parameter variations follow predictable patterns that can be implemented through standardized manufacturing processes, avoiding excessive device complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables a uniform light emitting effect and improved adhesive strength, reducing the likelihood of delamination and enhancing the reliability and display quality of liquid crystal display devices.
Implementation Method 1
Each of the first pattern shaping wires may include an electroactive polymer, and application of the control voltage to the first pattern shaping wires may be configured to change a shape of at least some of the first optical patterns.
Data Source
AI summary
A display device includes a display panel, a light guide plate, a first light source unit, and an optical member. The light guide plate is on the display panel. The first light source unit is configured to provide light to a side surface of the light guide plate. The optical member is between the light guide plate and the display panel. The optical member includes an interconnection layer, an optical pattern unit including first optical patterns on a surface of the interconnection layer, and first pattern shaping wires configured to receive a control voltage from the interconnection layer and to control a shape of each of the first optical patterns via the control voltage. Each of the first optical patterns is connected to a respective some of the first pattern shaping wires.